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Pressure responsive apparatus

  • US 4,091,669 A
  • Filed: 11/11/1976
  • Issued: 05/30/1978
  • Est. Priority Date: 11/18/1975
  • Status: Expired due to Term
First Claim
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1. Apparatus suitable for use as a pressure standard, comprising a reference container arranged, in use, to have a predetermined orientation and to be charged with a liquid whereby the pressure at a port in the lower part of the container is at a predetermined value, and wherein the container is sealed at an upper part by a closure member having characteristics such that the space above the liquid within the container is isolated from the external environment while being maintained at a pressure substantially equal to the pressure of the external environment.

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